Pulp-screening machine.



J. F. FISHER. PULP SCREENING MACHINE. APPLIGATION FILED 0012.7, 1908.

941,017. Patented News, 1909. l

'NETE ATES PATENT ECE.

JOI-IN E. FISHER, OF HINCKLEY, NEV YORK, ASSIGNOR, BY DIRECT AND MESNE AS- SIGNMENTS, T FISCHER SAVE-ALL COIWPANY, OF HINCKLEY, NEW YORK.

PULP-SCREENING MACHINE.

Speccaton of Letters Patent.

Patented Nov. 23, 1909.

Application filed October 7, 1908. Serial No. 456,522.

To all whom it may concern:

Be it known that I, JOHN F. FISHER, of Hinckley, in the county of Herkimer and State of New York, have invented certain new and useful Improvements in Pulp- Screening Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form part of this specification.

The object of my invention is to provide a pulp screening machine, which is simple in construction and eflicient. In the operation of pulp and paper machines, there is usually a constant waste, often very large, incident to particles of pulp and paper material contained in the large quantity of water utilized in the machines and discharged from these machines.

My invention is intended to receive the discharged water from pulp and paper machines, and, for that matter, from pulp and paper mills, and in a practicable and efficient manner clean out and save practically all the valuable materials which otherwise go to waste.

While show the device and have spoken of it as a pulp screening machine, it is what is technically known among paper manufacturers as a save-all and its uses are not confined within the strict meaning of the term, pulp screening machine, although it is here shown as such. As a matter of fact the machine is adapted to the work of what is known as filtering and slushing among other uses, and I do notwish to conne myself by reference to specific work.

Figure 1 is a vertical sectional view of a machine of my construction. F ig. 2 is a plan view of the same on a somewhat reduced scale from that shown in Fig. 1.

Referring to the reference figures in a more particular description, 10 indicates a frame which supports a series of separate and independent inclined screens 11*11, l212 mounted on independent removable frames disposed at a proper angle to effect discharge and clearance of material, such as an angle of forty-live degrees as shown, of forty-five degrees in the frame 10. The frame 10 supports along the upper outer sides the flow boxes 13-13, each having a low side indicated at 13a adjacent to the upper edge of the several screens and forming a spillway onto the several screens on each side of the machine. Below the lower end ofthe screens there is arranged a receiving trough 14 over the edges of which the lower ends of the screens 11 and 12 project, so that any material will pass readily from the surface of the screen into the receiving trough and the work of the screens remain unaffected by any accumulation in the trough or at the discharge ends of the screens. The receiving trough la is provideo with an outlet 15.

Extending longitudinally of the machine and under each set of screens is a spray pipe 16 having openings arranged to discharge onto or against the underside of each screen. These pipes 16 are carried in the. present showing by a pair of sprocket chains 17 mounted on lower and upper sprocket wheels 18 and 19 in the frame, so as to move up and down along the underside of the screen. The water under pressure will be brought to the pipe 16 by means of a flexible hose attached at one end.

One style of mechanism is shown for operating the device and moving spray pipes 16 up and down along the back of the screens and reversing the movement. The drive pulley 2O receives direct and cross belts 21 and 22 ruiming on two loose pulleys 23 and 24, and a single intermediate tight pulley 25, all on the end of shaft 26 carrying the lower sprocket wheels 18.

F or reversing the movement the belts 2l and 22 are shifted by means of a belt shifter 27. The belt shifter 27 is automatically shifted by providing a bar 28 secured to the under runs of the sprocket chains 17 and adapted to strike tappets 29 and 30 located adjacent to the sprocket wheels 18 and 19 respectively. The tappets 29 and 30 are connected by a bar 31 and operate a rock shaft 32, which is connected by a crank and bar 33 with a bell crank lever 34 and connectin rod 35 to the belt shifter.

When the machine is made double, as shown, a shaft 26, on the opposite side from that carrying the driving mechanism just described, is connected up and driven by a belt or sprocket chain 36.

In operation, the discharge from the paper or pulp mill is conducted into the liow boxes 13 and overflows the low side 13a in a sheet falling upon the upper end of the screens. By gravity it runs down the screens and the bulk of the water passes through the screen while the pulp and paper particles are strained out by the screen. From time to time as quantities of pulp accumulate on the upper face of the screen, they break loose from the screen by action of gravity, considering the steep angle of the screen, and roll down the screen into the receiving trough lll. The spray from the spray pipe 16, discharging against the underface of the screen, serves to clear and free the openings through the screen plates and assists in lifting and starting any acthat it will break loose and roll down the screen into the receiving trough and serves to keep the screens open and prevent the accumulation of matter and stoppage of thev screens. On some classes of work the machine will operate successfully without the spray pipe 16. Ordinarily, suflicient water will reach the receiving trough 14 with the pulp screened out to still keep the mass in fluid form and allow it to be handled from. the receiving trough lil back onto the machine or other suitable place by pumps.

This machine is cheap to build and can be extended to any desired length so as to handle very large quantities of discharged water from pulp and paper mills.

It is obvious that where circumstances require, only one set of screen plates and one flow box and receiving trough may be employed, and that other modifications and changes may be made without departing from the invention hereinafter intended to be claimed.

The several screens 11, 11, and 12, 12, it is to be noted are made distinct, independent and each removable, the line of division be-r ing distinctly shown between the several screens on either' side, which also represents suitable partition means or separating member. Therefore, any one or more of the screens on either side of the machine can be readily removed in case repairs are necessary and other ones immediately substituted without stopping the operation of the machine, the work being done almost instantly. Should it be necessary to remove any one of the screens for a length of time it will be obvious to any mechanic thaty discharge of material at that point can be prevented by slipping a plate into position against the inner face of the trough at the spillway, the plate projecting slightly above the spillway where the plate will be held in position by the weight of the contents of the trough.

What I claim as new and desire to secure by Letters Patent is:

1.7In a pulp screening device the comblnation of a frame, a flow box having a low side supported on the frame in an elevated position, a receiving trough mounted on the framel in a low position, a set of independent removable elongated screen frames with screens engaging at their lower ends with the upperl edge of the trough and at their upper ends with the low side of the flow box and arranged at an angle of approximately forty-five degrees to a perpendicular, a spray pipe adapted to discharge` against the under side of the screen and means for moving the spray pipe backward and forward adjacent to the under surface of the screen, substantially as set forth. cumulated sheet of pulp on the screen, so

2'.A In a machine of the character scribed, the combination of screen members, f each comprising a serres of independent and separate removable screening members, each disposed in a frame in a tilted position, a

Etrough having a spillway opening onto the f screenv mem-bers at the top thereof, a. trough located' below the ends of the screen meml bers whereby to provide a clearance for the discharge from the screen members into the trough at a substantially lower level, a spray pipe located underneath the screen members and transverse thereof, and mea-ns for recip-V rocating the said spray pipe upward and downward whereby to aid the passage of material downward along the screen face, substantially as described.

3. In a. device o-f the character described, the combination of a series of screen members disposed in oppositely disposed inclined frames,V each of said screen members beingV independently removable from its frame, a feed trough with a spillway adjacent the top edge of each frame and adapted to discharge material onto the upper end of each screen in the several frames, a trough located between the frames and below the lower end of the several screens and separate from the screens, a spray pipe underneath the screens in each frame extended transverse the screens therein, and means for reciprocating each spray pipe upward and downward along the under face of the screens in each frame whereby to prevent lodgment of material on the' said screens, substantially as described.

4. In a device of the character described, the combination of a spray pipe mounted on chain-carriers, means for rotating the carriers in either direction, and means for controlling said mechanism to reverse the direcsubstantially as described. said frames, substantially as described.

in a device of the Character described, In Witness whereof, I have affixed my sigthe combination of a plurality of screen nature, in presence of tivo Witnesses, this tion of movement of the said spray pipe, ciprocating the said pipes under each of lo l frames, with means for discharging material i 23rd day of Sept., 1908.

thereto and receiving the discharge there- JOHN F. FSHER. from, of spraj,7 pipes mounted to travel in a ltnesses: reciprocating movement along` the under J. H. DWYER, side of the said frames7 mechanism for re- W. A. FISCHER. 

